Improvement in jet-exhausters for gas-works



J. S. GONNELLY. Jet-Bxhauster for Gas- Works.

Patented May 27, A879.

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mixmsoe/s L C M I %%M UNITED STATES PATENT OFFICE.

JOHN S. CONNELLY, OF NEW CASTLE, PENNSYLVANIA.

IMPROVEMENT IN JET-EXHAUSTERS FOR GAS-WQRKS.

Specification forming part of Letters Patent No. 215,723, dated May 27,1879; application filed April 10, 1879.

To all whom it may concern:

Be it known that I, JOHN S'roRER CoN- NELLY,. of New Castle, in thecounty of Lawrence and State of Pennsylvania, have invented a new anduseful Improvement in Jet-Exhausters for Gas-Works and other purposes;and I do hereby declare the following to be a full, clear, and exactdescription thereof, reference beinghad to the accompanyingdrawings,forming part of this specification, in which- Figure 1 is a sideelevation of devices embodying my invention. Fig. 2 is a longitudinalcentral section. Fig. 3 is a transverse section on the line :0 m,Fig. 1. Fig. 4 is an enlarged sectional detail view.

Like letters refer to like parts wherever they occur.

My invention relates to the construction of jet-exhaust apparatus forgas-works and for various other purposes where such devices arerequired; and it consists, first, in the combination of a bypassexhaustpipe and suitable valves, the exhaust-pipe and valves beingarranged within the bypass, so that a compact, cheap, and eflicientjet-exhaust is obtained; and, secondly, in the combination, with aby-pass' and its exhaust-pipe and steamjet provided with agoverning-valve, of a return-pass with its valve and governor, wherebythe steam-jet may be set at its full working capacity, and the governorof the returnpass will serve to equalize the exhaust.

Exhaust apparatus for gas-works and for like purposes are of severalcharacters-viz.,

fans, pumps, jet-exhausts, &c.,-all as at present constructed more orless complicated and expensive. Of these the steam-jet exhaust isperhaps the most desirable for all purposes, but especially for smallgas-works, as its first cost is less, it demands no engine or equivalentmachinery to operate it, is simple, efficient, and can be operated atlittle expense; but so far as I am aware the exhaust-tube and bypass ineach and all of the known and recited exhausters have been separate andindependent each of the other, thus increasing the bulk of the devicesthe number of tight joints to be made, and materially adding to the sizeand to the cost of manufacture.

The object of the presentinvention is, therefore, to simplify, perfect,and cheapen the construction, and render the devices compact, andtherefore more available for small works.

I will now proceed to describe my invention, so that others skilled inthe art to which it appertains may apply the same.

In the drawings, A indicates a tube or pipe of any desiredcr0ss-sectional form, but preferably square, composed of any number oflongitudinal flanged sections or lengths a, and of such diameter as thecapacity-of the works demands. B indicates a tube of much less crosssectional area, suspended within the tube or pipe A, and constitutingthe exhausttube,'while the space between the tube, as at b, constitutesthe by-pass.

In order that the by-pass shall be closed when the exhaust is inoperation, and at liberty to open when the exhaust ceases to operate,automatic valves are essential, and these I preferably form as fiat orswinging valves 0 (I, hung so as to open away from the retorts orequivalent point, and having sufficient seats formed by flanges e 6, oneon the interior of tube A and the other on the exterior of tube B, so asto close and resist back-pressure.

S indicates the steam pipe, which passes through the outer tube, A, andterminates in a steam-jet, j, arranged within one end of exhaust-tube B.The steam-pipe at a point exterior to tube A is provided with a valve,'0, controlled by a scale-beam or balanced lever, It, so that the valvecan be set to give any desired pressure of steam to the jet withoutregard to the fluctuation of pressure in the boiler.

\Vith such devices I employ a return pass or passage, L, with a valve,on, connected to a float or cup, N, set in a water-tank, N, the interiorof the cup communicating withtube A or L, back of the exhaust, by apipe, n, so that the float or cup N will rise or fall according to thepressure back of the exhaust, as before specified.

The valve m, which may be a perforated gate, used in conjunction with aperforated diaphragm in pipe L, should be so set that the falling of thefloat N will open the tube or return-pass L, and permit the return ofthe gas from beyond the exhaust, as indicated by the arrows.

The jet j, with such devices, will then be set to the full workingcapacity of the exhaust, or at any desired pressure; and if thegas-supply runs short, or, in other words, if the pressure back of theexhaust decreases, the float will fall, and open valve 122, permittingthe return by return-pass L of sufficient gas to cause the properWorking of the apparatus.

G G indicate pressure-gages of any desired construction, usually of vthe water-columns g g one connected by a pipe, 9 with the tube A betweenthe exhaust and retort, or its equivalent, and the other connected withthe tube A between the exhaust and the delivery by pipe 9 so that thepressure existing on both sides of the valves of the bypass can bereadily determined.

The above devices will operate as follows: The jet j having been set togive the maximum exhaustdesired, and steam having been turned on, thegas will be drawn from the retort (or scrubber or equivalent point,) andforced through exhaust-tube B, entering pipe A at its forward end, theback-pressure serving to keep the valves of the by-pass closed.

The float N, having been properly weighted for the pressure at which theexhaust is to work, will fall when the pressure decreases, and openvalve on of return-pass L, permitting the return of sufficient gas tocause the proper working of the devices, but as soon as the pressurerises it will actuate the float, which will close valve m.

When for any reason the jet is not used, the

automatic valves 0 c d of the by-pass are free;

to swing open and permit the gas to pass, the same as when no exhaust isused.

In the drawings and description I have shownthe pipes A B and the jet jas square, for I prefer such cross-sectional form; butI do not wish orintend to limit myself to any specific: form of cross-section, for, asbefore indicated, any preferred form may be selected, and will workequally well, the choice of form being amatter of convenience inconstruction and matter of taste.

Having thus described the nature, advantages, and operation of myinvention, what I claim, and desire to secure by Letters Patent, 1s-

1. The combination of a bypass exhaustpipe and suitable valves, theexhaust-pipe and valves being arranged within the by-pass pipe,substantially as and for the purpose specified.

2. The combination, with the by-pass and exhaust-pipe, of the steam-jetand its governing-valve and the return-pass and its valve and governor,substantially as and for the purpose specified.

In testimony whereof I, the said JOHN STORER OONNELLY, have hereunto setmy hand.

JOHN STORER CONNELLY.

WVitnesses F. W. BITTER, J r., R. H. WHITTLESEY.

